Fix ERR_SSL_PROTOCOL_ERROR by clearing Chrome's Browsing Data From one obvious solution to another. If you already have the correct date & time, it's time to clear Chrome's cache and cookies. To do so, press Ctrl + Shift + Delete and erase your browsing data. Even if this hasn't fixed the "This site can't provide a secure connection" error, we recommend clearing your browsing data on a regular basis.
Fix ERR_SSL_PROTOCOL_ERROR by clearing your SSL State is the next thing you should try. Follow the steps below to do so: First, go to Customize and control Google Chrome, the three dots you see just below the X (close) button. Now click on Settings. Scroll down the page and open the Advanced Settings. Go to Open proxy settings by scrolling down or searching in the search bar. A window named 'Internet Properties' will open up. Go to the Content window and click on the Clear SSL State Button.
